Electric bicycle laws state by state via Wikipedia.
Electric Bicycle Laws - In General
Federal law says that an electric bicycle is considered a "bicycle" and the laws of bicycles apply if:
* The electric bicycle or power bicycle has less than 750 watt bike motor engine
* Functional pedals
* Max speed is less than 20mph
Federal definition of a bicycle
Sec. 1512.2. to read as follows:
(1) A two-wheeled vehicle having a rear drive wheel that is solely human-powered;
(2) A two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts (1 h.p.), whose maximum speed on a paved level surface, when powered solely by such a motor while ridden less than 20 mph.
Federal Public Law of "Low-Speed Electric Bicycles"
Public Law 107-319 (below)
State Electric Bike Laws